ENGINEERING PILLAR GUIDE
Corrugated Flute Grades Explained:
E-Flute vs B-Flute vs Kraft
By Nancy (Head Prepress Director)
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Published October 2026
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6 Min Read
When ordering custom boxes for your e-commerce brand, few decisions have a bigger impact on shipping costs, structural protection, and unboxing aesthetics than your choice of corrugated flute grade.
Summary Comparison Table
| Flute Grade | Thickness | Best Application |
|---|---|---|
| E-Flute | 1/16" (1.6 mm) | Mailer boxes, DTC kits, cosmetics, high-res printing. |
| B-Flute | 1/8" (3.2 mm) | Heavier retail products, canned goods, moderate shipping. |
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